diff --git a/ext/win32/resolv/resolv.c b/ext/win32/resolv/resolv.c
index 9150df5..00173e5 100644
--- a/ext/win32/resolv/resolv.c
+++ b/ext/win32/resolv/resolv.c
@@ -247,11 +247,11 @@ InitVM_resolv(void)
 
     reg_key_class = regkey;
     rb_undef_alloc_func(regkey);
-    rb_define_private_method(singl, "get_dns_server_list", get_dns_server_list, 0);
-    rb_define_private_method(singl, "tcpip_params", tcpip_params_open, 0);
-    rb_define_method(regkey, "open", reg_open, 1);
-    rb_define_method(regkey, "each_key", reg_each_key, 0);
-    rb_define_method(regkey, "value", reg_value, 1);
+    rb_define_private_method(singl, "get_dns_server_list", RUBY_METHOD_FUNC(get_dns_server_list), 0);
+    rb_define_private_method(singl, "tcpip_params", RUBY_METHOD_FUNC(tcpip_params_open), 0);
+    rb_define_method(regkey, "open", RUBY_METHOD_FUNC(reg_open), 1);
+    rb_define_method(regkey, "each_key", RUBY_METHOD_FUNC(reg_each_key), 0);
+    rb_define_method(regkey, "value", RUBY_METHOD_FUNC(reg_value), 1);
 }
 
 void
diff --git a/test/resolv/test_win32_config.rb b/test/resolv/test_win32_config.rb
index 6167af6..9e5c115 100644
--- a/test/resolv/test_win32_config.rb
+++ b/test/resolv/test_win32_config.rb
@@ -3,7 +3,8 @@
 require 'test/unit'
 require 'resolv'
 
-if defined?(Win32::Resolve)
+# JRuby loads its bundled win32/resolv, which lacks the registry access of the extension.
+if defined?(Win32::Resolv) && Win32::Resolv.respond_to?(:tcpip_params, true)
   class TestWin32Config < Test::Unit::TestCase
     def test_get_item_property_string
       # Test reading a string registry value